Citation and License

Nutrition Journal 2013, 12:73
doi:10.1186/1475-2891-12-73

Published: 6 June 2013

Abstract

Background

Very little is known about the longitudinal changes in energy requirements in late
life. The purposes of this study were to: (1) determine the energy requirements in
late life and how they changed during a 7 year time-span, (2) determine whether changes
in fat free mass (FFM) were related to changes in resting metabolic rate (RMR), and
(3) determine the accuracy of predicted total energy expenditure (TEE) to measured
TEE.

Results

The energy requirements in the 9th decade of life were 2208 ± 376 kcal/d for men and
1814 ± 337 kcal/d for women. This was a significant decrease from the energy requirements
in the 8th decade of life in men (2482 ± 476 kcal/d vs. 2208 ± 376 kcal/d) but not
in women (1892 ± 271 kcal/d vs. 1814 ± 337 kcal/d). In addition to TEE, RMR, and activity
EE (AEE) also decreased in men, but not women, while FFM decreased in both men and
women. The changes in FFM were correlated with changes in RMR for men (r = 0.49, p < 0.05)
but not for women (r = −0.08, ns). Measured TEE was similar to Dietary Reference Intake
(DRI) predicted TEE for men (2208 ± 56 vs. 2305 ± 35 kcal/d) and women (1814 ± 42
vs. 1781 ± 20 kcal/d). However, measured TEE was different than the World Health Organization
(WHO) predicted TEE in men (2208 ± 56 vs. 2915 ± 31 kcal/d (p < 0.05)) and women (1814 ± 42
vs. 2315 ± 21 kcal/d (p < 0.05)).

Conclusions

TEE, RMR and AEE decreased in men, but not women, from the 8th to 9th decade of life.
The DRI equation to predict TEE was comparable to measured TEE, while the WHO equation
over-predicted TEE in our elderly population.